package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
             只能查询自己的购物车数据
             判断当前商品是否在购物车中
             如果已经存在，就更新数量，数量加1
             如果不存在，插入数据，数量就是1
             判断当前添加到购物车的是菜品还是套餐
     * @param shoppingCartDTO
     */
    public void addCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0) {
            ShoppingCart shoppingCart1 = list.get(0);//获取第一条记录（理论上应该只有一条）
            shoppingCart1.setNumber(shoppingCart1.getNumber() + 1);
            shoppingCartMapper.updateNumber(shoppingCart1);
        }else{
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                Dish dish = dishMapper.selectById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    /**
     * 查看数据库
     * @return
     */

    public List<ShoppingCart> showCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);
        return shoppingCarts;
    }

    /**
     * 清空购物车
     */
    public void cleanCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        shoppingCartMapper.deleteAll(shoppingCart);
    }

    /**
     * 购物车中删除一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void deleteCartById(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0) {
            ShoppingCart shoppingCart1 = list.get(0);
            if(shoppingCart1.getNumber()>1){
                shoppingCart1.setNumber(shoppingCart1.getNumber() - 1);
                shoppingCartMapper.updateNumber(shoppingCart1);
            }else {
                shoppingCartMapper.deleteCart(shoppingCart1);
            }
        }

    }
}
